@article{Er1985, 
     author = "Er, M. C.", 
     doi = "10.1093/comjnl/28.5.538", 
     issn = "0010-4620", 
     journal = "The Computer Journal", 
     link = "http://comjnl.oxfordjournals.org/content/28/5/538.abstract http://comjnl.oxfordjournals.org/content/28/5/538.short http://comjnl.oupjournals.org/cgi/doi/10.1093/comjnl/28.5.538", 
     month = "may", 
     number = "5", 
     pages = "538--542", 
     title = "Enumerating Ordered Trees Lexicographically", 
     uri = "http://comjnl.oxfordjournals.org/content/28/5/538.abstract", 
     volume = "28", 
     year = "1985", 
}

Problems: 365